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--[[
Copyright (C) 2016 ZTE, Inc. and others. All rights reserved. (ZTE)
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
--]]
-- the client for redis, include the connection pool management and api implements
local redis = require('resty.redis')
local tbl_util = require('lib.utils.table_util')
local _M = {
}
_M._VERSION = '0.0.1'
_M._DESCRIPTION = 'msb_redis_module'
local mt = { __index = _M }
local tbl_insert = table.insert
local tbl_sort = table.sort
local tbl_isempty = tbl_util.isempty
function _M.new(self, conf)
self.host = conf.host
self.port = conf.port
self.timeout = conf.timeout
self.dbid = conf.dbid
self.poolsize = conf.poolsize
self.idletimeout = conf.idletimeout
local red = redis:new()
return setmetatable({redis = red}, mt)
end
function _M.connectdb(self)
local host = self.host
local port = self.port
local dbid = self.dbid
local red = self.redis
if not (host and port) then
return nil, 'no host:port avaliable provided'
end
--set default value
if not dbid then dbid = 0 end
local timeout = self.timeout
if not timeout then
timeout = 1000 -- 1s
end
red:set_timeout(timeout)
local ok, err
if host and port then
ok, err = red:connect(host, port)
if ok then return red:select(dbid) end
end
return ok, err
end
function _M.keepalivedb(self)
local max_idle_timeout = self.idletimeout --ms
local pool_size = self.poolsize
if not pool_size then pool_size = 100 end
if not max_idle_timeout then max_idle_timeout = 90000 end --90s
local ok, err = self.redis:set_keepalive(max_idle_timeout, pool_size)
if not ok then
ngx.log(ngx.ERR, "redis pool keepalive error",err)
return
end
return
end
--inner function,only used in this module
local function _hgetall(red,key)
local resp,err = red:hgetall(key)
--if not resp or next(resp) == nil then
if tbl_isempty(resp) then
return nil, "key "..key.." not found"
end
local hashinfo = red:array_to_hash(resp)
return hashinfo,nil
end
function _M.getserviceinfo(self,key)
if not key then
return nil,'no key is provided'
end
local c, err = self:connectdb()
if not c then
return nil, err
end
local red = self.redis
local resp,err = red:get(key) --the key will create dynamically
self:keepalivedb()
if not resp or resp == ngx.null then
return nil, "key "..key.." not found"
else
return resp,nil
end
end
function _M.getbackservers(self,keypattern)
if not keypattern then
return nil,'no keypattern is provided'
end
local c, err = self:connectdb()
if not c then
return nil, err
end
local red = self.redis
local resp, err = red:keys(keypattern)
if tbl_isempty(resp) then
self:keepalivedb()
return nil, "no server matched"
end
local servers = {}
for i, v in ipairs(resp) do
local serverinfo,err = _hgetall(red,v)
if serverinfo then
tbl_insert(servers,serverinfo)
end
end
self:keepalivedb()
return servers,nil
end
function _M.getcustomsvcnames(self,keypattern)
if not keypattern then
return nil,'no keypattern is provided'
end
local c, err = self:connectdb()
if not c then
return nil, err
end
local red = self.redis
--store svc names into the Set
local svcname_set={}
local res, err = red:scan("0","count",50,"match",keypattern)
if not res then
self:keepalivedb()
return {}, "failed to scan in getcustomsvcnames()"
end
local cursor, keys, err = unpack(res)
for _, svckey in ipairs(keys) do
local m, err = ngx.re.match(svckey, "^.+:custom:([^:]+)", "o")
if m then
svcname_set[m[1]]=true
end
end
while( cursor ~= "0" )
do
res = red:scan(cursor,"count",50,"match",keypattern)
if not res then
break
end
cursor, keys, err = unpack(res)
for _, svckey in ipairs(keys) do
local m, err = ngx.re.match(svckey, "^.+:custom:([^:]+)", "o")
if m then
svcname_set[m[1]]=true
end
end
end
self:keepalivedb()
local svcnames = {}
for svcname,_ in pairs(svcname_set) do
tbl_insert(svcnames,svcname)
end
--sort the key_table in reverse order
tbl_sort(svcnames, function (a, b)
return a > b
end)
return svcnames,nil
end
return _M
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